Ball flat steel is a special shape of steel, mainly composed of a flat web and a ball head. Spherical flat steel is usually used in the field of shipbuilding and bridge construction, of which Marine spherical flat steel is an auxiliary medium material for shipbuilding, mainly used as a reinforcement of the ship plate, which is equivalent to the ribs of the human body. The cross-section shape of this steel may be trapezoidal, and its ends may be semicircular. The material of ball flat steel is generally No. 20 steel or Q235B steel, which has excellent mechanical properties and comprehensive properties. Although there are also cold-rolled versions of flat-rolled steel, hot-rolled flat-rolled steel is more common, and its specifications range from 2# to 20#. It is widely used in building structures and engineering structures, such as beams, Bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks and warehouse shelves.